package com.zx.ruiji.filter;

import com.alibaba.fastjson.JSON;
import com.zx.ruiji.common.BaseContext;
import com.zx.ruiji.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebFilter(filterName = "LoginCheck", urlPatterns = "/*")
@Slf4j
public class LoginCheckFilter implements Filter {

    //路径匹配器，支持通配符
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        //获取请求URI
        String requestURI = request.getRequestURI();
        log.info("拦截到请求{}", requestURI);
        //不需处理URL集合
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/login",
                "/user/sendMsg",
                "/doc.html",
                "/webjars/**",
                "/swagger-resources",
                "/v2/api-docs"
        };
        //处理URI
        boolean check = check(urls, requestURI);
        //放行
        if (check || request.getSession().getAttribute("employee") != null) {
            log.info("放行{}", requestURI);
            Long empId = (Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empId);
            filterChain.doFilter(request, response);
            return;
        }
        if (request.getSession().getAttribute("user") != null) {
            log.info("放行{}", requestURI);
            Long userId = (Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId);
            filterChain.doFilter(request, response);
            return;
        }


        //响应前端数据---NOTLOGIN，前端进行登录页面跳转
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        log.info("未登录");
        return;
    }

    public boolean check(String[] urls, String requestURI) {
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURI);
            if (match) {
                return true;
            }
        }
        return false;
    }
}
